问题
单项选择题
烧结矿碱度表达式（）。
A．CaO/SiO2
B．（SiO2+MgO）/Ca
C．CaO/（SiO2+MgO）
答案
参考答案：A
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烧结矿碱度表达式（）。
A．CaO/SiO2
B．（SiO2+MgO）/Ca
C．CaO/（SiO2+MgO）
参考答案：A
In my early childhood, my parents and teachers taught me to be persistent (执着) in every task I devoted myself to. I was ____ that persistence is the only way towards success. But a small ____ made me change my mind. One day my twoyearold son, ___ at a dozen of “stood” color markerpens, cheered excitedly，“Mummy, look! I did it.” Afterwards, he collected some ballpens, ____ to do the same. Hard though he tried, the ballpens just lay ____. He turned to me for help. Noticing they had either sharp or round ends, I said ____， “Mummy can't help you.” To my surprise, he wouldn't listen and continued trying... I was dumbfounded by his persistence. My son's behaviour reminded me of George who was always ____ in his work and rarely talked to anyone. To him, ____， there was no such thing called weekends or holidays. Our boss praised __ about him and ___ us to look up to him as a role model. One day I met George. “Gonna work late again tonight？” “Probably can't leave till midnight，” he said. “How many hours have you put in here each week, eighty or ninety？” “____.” “Don't you have time to be with your family at all？” He shook his head slowly and ____ a sigh. “It's not what I wanted. But I have worked on it for so long. It's much too ____ to even think about letting go.” A year later I resigned. The ____ thing I heard about him was that his wife divorced him. Since then I've never seen him. But occasionally his aged ____ would come to my mind. Until that day, ____ knowing why the ballpens couldn't stand up, the twoyearold had ____ the impossibility after many failures. He put aside all the ballpens and kept only those water markers for his “game”. ___， he already learned to let go of his previous ____ attempts. In our daily life, many headaches can be avoided if we know how to ____ them and then decisively let go of them immediately.
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